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Which of the following penetrating liquid is used in a liquid penetration test?

Liquid penetrant testing is a non-destructive material examination procedure used to check for deficiencies such as cracks by spreading a thin liquid dye onto the material's surface, followed by the application of a developer.

  • In liquid penetration tests, either petroleum or water-based carrier fluids are used as solvents or cleaners according to the type of penetrant used.
  • The petroleum-based carrier fluid is used as a penetrating liquid in the liquid penetration test along with fluorescent red color dye for visible light.